bonsoir
A = 2 ( 5 x + 2) ( 3 x + 1)
a) 2 ( 5 x + 2) = 10 x + 4
b) ( x + 2) ( 3 x + 2) = 3 x² + 2 x + 6 x + 4 = 3 x² + 8 x + 4
B = ( x + 2) ( 3 x + 2) ( x + 4) = (3 x² + 8 x + 4) ( x + 4)
= 3 x ³ + 12 x² + 8 x² + 32 x + 4 x + 16
= 3 x ³ + 20 x² + 36 x + 16
C = 4 ( 5 x - 1) ( 3 x + 3)
C = ( 20 x - 4) ( 3 x + 3)
C = 60 x² + 60 x - 12 x - 12
c = 60 x² + 48 x - 12
d = ( 1 - x) ( 1 + x) ( 2 x + 1)
d = ( 1 + x - x - x²) ( 2 x + 1)
d = ( - x² + 1) ( 2 x + 1)
d = - 2 x ³ - x² + 2 x + 1
